10-4 population patterns. 1. population properties size (often hard to measure) density– amount of...

10-4POPULATION PATTERNS

1. POPULATION PROPERTIES

• Size (often hard to measure)

• Density– amount of population per unit of area (population crowding)

# of individuals = population density

area (units2)

• Dispersion – spatial organization of the population

1. POPULATION PROPERTIES

Dispersion – spatial organization of the population

1. POPULATION PROPERTIES

Dispersion – spatial organization of the population

•Clumped – population is clustered together, usually around resources or from social behavior

ex/ school of fish

clumped

1. POPULATION PROPERTIES

Dispersion – spatial organization of the population

•Uniform – the population is evenly dispersed from each other usually from social interactions

ex/ bird nesting sites or solitary predators

uniform

1. POPULATION PROPERTIESDispersion – spatial organization of the population

•Random – the population is randomly scattered throughout the area

EX: Dandelions from random wind dispersion of seeds

random

2. POPULATION DYNAMICS

Age Structure

i. the number of individuals of different ages within the population

2. POPULATION DYNAMICS

Age Structure

i. the number of individuals of different ages within the population

ii. different age groups may have different abilities such as birth/death rates

2. POPULATION DYNAMICS

Survivorship Curve

• probability of individuals surviving to a certain age

2. POPULATION DYNAMICS

Survivorship Curve

• probability of individuals surviving to a certain age

I – Low birth rate, low infant mortality, survives to old age (Humans & large mammals)

2. POPULATION DYNAMICS

Survivorship Curve

• probability of individuals surviving to a certain age

I – Low birth rate, low infant mortality, survives to old age (Humans & large mammals)

2. POPULATION DYNAMICS

II – Survivorship rate equal at all ages

(Birds & reptiles)

2. POPULATION DYNAMICS

II – Survivorship rate equal at all ages

(Birds & reptiles)

2. POPULATION DYNAMICS

III – High birth rate, high infant mortality rate (Fish, Insects, Plants)

2. POPULATION DYNAMICS

III – High birth rate, high infant mortality rate (Fish, Insects, Plants)